I have input form in a add.ctp
echo $this->Form->input('Postdetail.0.post_text', array('label' => 'متن ', 'id' => 'editkoniman'));
And i want the result of that warped in a htmlspecialchars function befor saving in a database because i use summernote bootstrap WYSIWYG editor in a modal box
Let me explain how to implement your requirement.
As like @mark said, just save the data in your controller
$this->{YourModel}->save($this->request->data);
Here $this->request->data
contains your post data.
To display the post_text
in your view just put the strings in h()
function to escape html characters
h($yourvariable['ModelName']['post_text'])